A woman died after being shoved in front of an oncoming subway in the heart of Times Square Monday, and a woman arrested in the deadly shove may be linked to another subway death, police sources familiar with the investigation tell NBC 4 New York. Checkey Beckford reports. (Published Tuesday, Nov. 8, 2016)

What to Know

Police say the suspect, Melanie Liverpool, is emotionally disturbed

She allegedly pushed the woman into the path of an oncoming train at the busy station Monday, killing her

Authorities say Liverpool has previously claimed she shoved another person in front of a train at the Union Square station

A former home health aide rolled her eyes and insisted she wasn't guilty as she was charged Tuesday with shoving a woman onto the subway tracks under Times Square, killing her.

Prosecutors said Melanie Liverpool had confessed to killing 49-year-old Connie Watton, of Queens, but she rebuffed the claim at her arraignment on a murder charge.

"What? I didn't admit to nothing," Liverpool said before the judge reminded her she had a lawyer to speak for her.

Liverpool, 30, was ordered held without bail. She appeared unruffled by the charges during Tuesday's brief proceeding. Authorities have described her as emotionally disturbed, but her lawyer, Mathew Mari, said she had declined to give him any details on her medical history.

1 in Custody After Person Shoved Into Path of Oncoming Subway Train at Times Square Station: Police

A woman died after being shoved in front of an oncoming subway in the heart of Times Square Monday, and a female suspect was taken into custody, police sources familiar with the investigation tell NBC 4 New York. (Published Monday, Nov. 7, 2016)

"She's adamant that she did not confess and that she's not guilty" and didn't want to discuss anything else, Mari said.

Authorities said Liverpool and Watton were talking or arguing on a platform at the 42nd Street-Seventh Avenue station around 1 p.m. Monday before Liverpool pushed Watton in front of an approaching train. She was found dead under it, and Liverpool was apprehended within minutes.

Now the NYPD is reexamining the subway death, law enforcement officials said.

Subway deaths from pushes are not common, but there have been a few in the past few years. In 2014, Kevin Darden, 34, was charged with killing a 61-year-old immigrant from Hong Kong, Wai Kuen Kwok, by shoving him into the path of a subway train in the Bronx. He pleaded guilty to manslaughter and is awaiting sentencing.

In 2012, Erika Menendez, a mentally ill woman who had a history of attacking strangers, shoved an immigrant from India off a subway platform in Queens. She pleaded guilty to manslaughter and was sentenced to 24 years in prison. The victim, Sunando Sen, was 46.

Also in 2012, a homeless man, Naeem Davis, was arrested and charged with shoving Ki-Suck Han, a Korean immigrant, into the path of a subway train at a station near Times Square.

A fatal subway push in 1999 led to a state law, known as Kendra's Law, that allows supervision of certain patients outside of institutions to make sure they're taking medications and don't present a public safety threat. It came after the death of Kendra Webdale, who was pushed to her death by a former mental patient.